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Summary of Contents for Williams Sound PPA 250
- Page 1 Installation Guide & User Manual PERSONAL PA ® Pro Wide–band System 250 Wireless FM Listening System Transmitter Model T4 ® Williams Sound Receiver Models R7, R7–4 Helping People Hear MAN 071 D...
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Page 2: Table Of Contents
– PPA 250 BAND YSTEM ODEL & U NSTALLATION UIDE ANUAL Contents Page FAST SET-UP PROCEDURE YSTEM VERVIEW ONTROLS AND ONNECTORS ETAILED ROCEDURE OUNTING THE RANSMITTER NSTALLING THE NTENNA HOOSING A HANNEL HOOSING AND ONNECTING AN UDIO OURCE HOOSING AN... - Page 3 IMPORTANT: If you choose to connect to 70 Volt Speaker line, be certain to set the Audio Config switch correctly. Severe damage will occur if you do not. ® Williams Sound Helping People Hear...
- Page 4 Set the Audio Select DIP Switches Set the Audio Select switch for the type of source you’re using. If you have used the audio cable provided with the PPA 250, there is no need to change the factory set configuration.
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Page 5: System Overview
Your PPA 250 has two principal parts: the T4 Transmitter and the R7 Receivers. Much like a miniature radio station, the transmitter and microphone pick up the sounds you want to hear and broadcast them over an FM radio signal. - Page 6 Can be used for monitoring, recording, or as a feed for other equipment. Audio Input Model PPA T4 Auditory Assistance FM Transmitter Williams Sound Corp., Minneapolis, MN USA (XLR) Bal. Mic Bal./Unbal line or 70V Antenna Line Out FM Channel,...
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Page 7: Controls And Connectors
– 3 dB AT 730 Hz TRS PHONE AUDIO INPUT 3 PIN BAL/UNBAL LINE OFF OFF See page 13 for plug wiring diagrams. MIC W/SIMPLEX BAL/UNBAL LINE OFF OFF BAL/UNBAL LINE BAL/UNBAL LINE BAL/UNBAL 70 V BAL/UNBAL 70 V ® Williams Sound Helping People Hear... - Page 8 Normally, one of these would be connected to the common output terminal of the power amplifier connected to the speaker line. But in most installations, there cannot be an external connection from the common terminal of a power amplifier to ground. To avoid this ® Williams Sound Helping People Hear...
- Page 9 RF in some audio equipment. Williams Sound offers a document (Technical Bulletin: Buzz Or Hum In The Sound System, FRM 531) giving suggestions for improving RF immunity in existing audio equipment.
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Page 10: Detailed Setup Procedure
NGINEERED NSTALLATIONS The transmitter can be mounted in an equipment rack. Use a Williams Sound rack mount kit (RPK 005 or RPK 006). Make sure there is good electrical contact between the transmitter chassis and the rack cabinet. -
Page 11: Channel
Try retuning if the problem remains. 5: U IGURE SING UDIO ABLE UPPLIED NBALANCED ONNECTIONS From Sound System To T4 Audio Input Amplifier's Line Output RCA to RCA Cable RCA to 1/4" Adapter ® Williams Sound Helping People Hear... - Page 12 Set the Audio Select switch for the type of source you have (See Figure 6.) and plug in a suitable audio cable. If those jacks are already in use, a simple “Y cord” can easily make the connection. See Figure 5 for use of the PPA 250’s audio cable. NGINEERED...
- Page 13 The audio should not be subject to a compressor, limiter, or other signal processing equipment. The transmitter has an effective audio processor. Additional compression is ® Williams Sound Helping People Hear...
- Page 14 8: T4 A IGURE UDIO ROCESSOR ERFORMANCE Hard Limiter (Always Functional) Compress –10 –20 Limit –30 Audio "-12 dB" Light ON Audio "0 dB" Light ON –40 –40 –30 –20 –10 RELATIVE INPUT LEVEL ® Williams Sound Helping People Hear...
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Page 15: Power
Play a compact disc or other quality audio source through the complete sound system at a level that is typical of normal operation. Adjust the Audio Input control so that the Level Indicator 0 dB LED generally lights and the +6 dB LED lights occasionally. ® Williams Sound Helping People Hear... -
Page 16: Assuring Excellent Performance
XCELLENT ERFORMANCE The PPA 250 consists of a transmitter and several receivers used to deliver an audio signal to listeners who are hard of hearing. The audio signal is usually provided by equipment manufactured and installed by others. The PPA 250 provides excellent audio performance under most conditions. -
Page 17: Receiver Use Instructions
If you’re using the PPA 250 with an existing sound system, make sure the sound system is turned on. Have someone speak into a sound system microphone while you listen with the receiver and earphone. - Page 18 (i.e., Neckloop) and personal hearing aid. SING ECEIVER EARING Williams Sound PPA Receivers can be used with hearing aids using three different methods: ECKLOOP ELECOIL OUPLER Neckloops are cords which hang around the neck and couple magnetically with T-Coil equipped hearing aids.
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Page 19: Battery Information
The R7 can also use 6 or 7 cell nickel cadmium rechargeable batteries. Optimal battery life is achieved with 7 cell batteries, such as the Williams Sound BAT 003. 6 cell batteries are usually marked “7.2 V”; 7 cell batteries are marked “8.4 V”. A fully charged 7 cell battery such as the BAT 003 will provide about 6 hours of operation per charge. - Page 20 HANGE NSTRUCTIONS Normally, the PPA 250’s factory-set channel (usually 72.9 MHz) requires no change. However, if another hearing assistance system or authorized radio service is operating on 72.9 MHz in your area, it may prove necessary to use an alternate channel In this event, the PPA System 250’s operating frequency can easily be changed to an alternate...
- Page 21 A plastic tuning wrench (PLT 005) is needed to adjust the receiver tuning coil. Most Williams Sound receivers, including R7’s, are set at the factory to 72.9 MHz. (Yours may have been set to another channel when they were ordered.) To change the frequency of...
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Page 22: Suggestions For Receiverm
The receivers can be stored in a multiple compartment storage case with a credit card or driver’s license left as collateral for the receiver. Regular users purchase their own earphone or headphone and bring them to use with receivers at the facility. ® Williams Sound Helping People Hear... -
Page 23: Trouble Shooting Guide
Level control counter–clockwise. If the Audio Level control is set near fully counter–clockwise, the Audio Select switch is set incorrectly. Set Audio Select switch to match your audio source and/or readjust the source. ® Williams Sound Helping People Hear... - Page 24 Perhaps there is a strong interfering signal. If so, make sure the transmitter and antenna are correctly installed. Set the transmitter to FULL power output. If this does not solve the problem, change the PPA 250’s frequency by setting the FM Channel/FM Power Switch according to the instructions on page 24.0...
- Page 25 If an interfering signal is causing overload in the receivers, see the section on insufficient range above. If changing channels does not remedy the problem, use other technology, such as Williams Sound Narrow Band FM or Williams Sound Infrared.
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Page 26: Warranty
RF immunity in existing audio equipment. (Technical Bulletin: Buzz Or Hum In The Sound System, FRM 531) ARRANTY The Williams Sound T4 Transmitter and R7, R7-4, R7-6, and R16 Receivers are warranted against defects in workmanship and materials for FIVE YEARS. - Page 27 Pro Wide–band System, Model PPA 250 SPECIFICATIONS PERSONAL PA Transmitter Model T4 Dimensions, Weight: 8.45" (21.5 cm) W x 8.18" (20.8 cm) D Frequency Accuracy: ±.005% stability, 0-50˚ C x 1.72" (4.4 cm) H, 3lbs. (1.5 kg) Deviation: ± 75 kHz maximum...
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